河北省冬麦区干热风成因分析

Causation analysis of Dry-Hot Wind Formation in Hebei Province Winter Wheat Region

利用河北省冬麦区1971—2005年5月10日至6月10日逐日降水、气温、湿度、风向风速及同期500hPa高度场等资料,采用小波分析、滑动-t检验等统计方法,对冬麦区近35年来干热风时空分布、周期、突变等特征进行了分析,同时对河北省冬麦区干热风成因进行了分析。分析表明轻度和重度干热风年平均发生日数分布具有一致性;而轻度和重度干热风的周期、年代际变化等均具有不同特征;干热风偏多、偏少除与同期气温、降水有关外,还与同期500hPa环流形势场关系密切。

Based on daily precipitation, temperature, humidity, wind speed, wind direction and 500hPa height data during 10, May to 10,June from 1971 to 2005, by using trend analysis , wavelet analysis, sliding-t test and other methods, the temporal-spatial distribution, change period, abrupt change and other feature of dry-hot wind are analyzed in Hebei province winter wheat region during recent 35 years. The results indicate that annual average days of light dry-hot wind are consistent with those of the severe; but the period and interannual variability between the light and the severe dry-hot wind are different. In addition, the number of annual days of the dry-hot wind is related with temperature, precipitation and 500hPa circulation pattern at same time. These results set up a foundation to forecast later dry-hot wind.